Finally got BOOT:=cat6000-sup.6-4-4a.bin I think it will be fine Thanks for your help

This is still not working has anyone any other ideas

Thanks for that info I have obtained and uploaded that image however getting msg that file not found but string added to boot variable:Do I change the config-reg setting

Here is output from sh ver, boot and dir.I have also included sh flash and msg I get when I try to set boot variablesh verWS-C6506 Software, Version NmpSW: 5.5(7)Copyright (c) 1995-2001 by Cisco SystemsNMP S/W compiled on Apr 2 2001, 15:45:31System...

Have downloaded a new image but still getting same error that file is not a valid image error. Thanks have already tried what you suggested.